In one embodiment, the electronic circuit includes a first amplifying circuit configured to generate a first compensation voltage based on a first reference voltage and an output voltage. The output voltage is from a functional circuit bloc. A second amplifying circuit is configured to generate a control voltage based on an input voltage, a second reference voltage and the first compensation voltage. The second reference voltage is different than the first reference voltage.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An electronic circuit, comprising: a reference voltage generating circuit configured to generated a second reference voltage and a third reference voltage from a first reference voltage, the reference voltage generating circuit including a first voltage divider configured to obtain the second reference voltage by dividing the first reference voltage by a first ratio; a feedback circuit configured to generate an input voltage from an output voltage, the feedback circuit includes a second voltage divider configured to obtain the input voltage by dividing the output voltage by a second ration, the output voltage being from a functional circuit block; a first amplifying circuit configured to generate a first compensation voltage based on the second reference voltage, a control voltage, and the input voltage; and a second amplifying circuit configured to generate the control voltage by performing an auto zeroing operation based on the output voltage, and the third reference voltage, wherein the second reference voltage than the first reference voltage.
2. The electronic circuit of claim 1 , wherein the second reference voltage is the first ratio of the first reference voltage.
3. The electronic circuit of claim 2 , wherein the input voltage is the second ratio of the output voltage.
4. The electronic circuit of claim 3 , wherein the first ratio is proportional to the second ratio.
5. The electronic circuit of claim 3 , wherein the first ratio is the same as the second ratio.
6. The electronic circuit of claim 1 , wherein the input voltage is a ratio of the output voltage.
7. The electronic circuit of claim 1 , wherein the third reference voltage is a bypassed voltage from the first reference voltage.
8. The electronic circuit of claim 1 , wherein the first ratio is proportional to the second ratio.
9. The electronic circuit of claim 1 , wherein the first ratio is same as the second ratio.
10. The electronic circuit of claim 1 , wherein the second amplifying circuit is configured to output the control voltage to the functional circuit block.
11. The electronic circuit of claim 1 , wherein the first amplifying circuit is configured to receive the first reference voltage at a first non-inverting terminal, and receive the output voltage at a first inverting terminal; and the second amplifying circuit is configured to receive the second reference voltage at a second non-inverting terminal, receive the input voltage at a second inverting terminal, and receive the first compensation voltage at a null terminal.
12. The electronic circuit of claim 11 , wherein the first amplifying circuit includes a first null non-inverting terminal and a first null inverting terminal, and the first amplifying circuit is configured to receive the third reference voltage at the first null non-inverting terminal; and the second amplifying circuit includes a second null non-inverting terminal and a second null inverting terminal, and the second amplifying circuit is configured to receive the first compensation voltage at the second null non-inverting terminal, and receive a fourth reference voltage at the second null inverting terminal.
13. The electronic circuit of claim 1 , further comprising: a switching architecture configured to, in a first operation, apply the output voltage to a non-inverting terminal and an inverting terminal of the first amplifying circuit, and connect an output of the first amplifying circuit to a null inverting terminal of the second amplifying circuit; and the switching architecture configured to, in a second operation, apply the output voltage to the inverting terminal of the first amplifying circuit, apply the first reference voltage to the non-inverting terminal of the first amplifying circuit, disconnect the output of the first amplifying circuit from the null inverting terminal of the first amplifying circuit, and apply the output of the first amplifying circuit to a null non-inverting terminal of the second amplifying circuit.
14. The electronic circuit of claim 13 , further comprising: a first charge storing circuit connected to the null non-inverting terminal of the second amplifying circuit; a second charge storing circuit connected to the null inverting terminal of the second amplifying circuit; a third charge storing circuit connected to the null non-inverting terminal of the first amplifying circuit; and a fourth charge storing circuit connected to the null inverting terminal of the first amplifying circuit.
15. The electronic circuit of claim 14 , wherein the switching architecture is configured to, in the first operation, apply third reference voltage to the null non-inverting terminal of the first amplifying circuit; and the switching architecture is configured to, in the second operation, apply a fourth reference voltage to the null inverting terminal of the second amplifying circuit.
16. The electronic circuit of claim 15 , wherein the fourth reference voltage is a same as the third reference voltage.
17. The electronic circuit of claim 15 , further comprising: a first divider circuit configured to divide the first reference voltage by a first ratio to obtain the second reference voltage; and a second divider circuit configured to divide the output voltage by a second ratio to obtain the input voltage.
18. The electronic circuit of claim 17 , wherein the first ratio is proportional to the second ratio.
19. An electronic circuit, comprising: a first amplifying circuit configured to generate a first compensation voltage based on a first reference voltage and an output voltage, the output voltage being from a functional circuit block; a second amplifying circuit configured to generate a control voltage based on an input voltage, a second reference voltage and the first compensation voltage, the second reference voltage being different than the first reference voltage; and wherein the first amplifying circuit is configured to receive the first reference voltage at a first non-inverting terminal, and receive the output voltage at a first inverting terminal; the second amplifying circuit is configured to receive the second reference voltage at a second non-inverting terminal, and receive the input voltage at a second inverting terminal; the first amplifying circuit includes a first null non-inverting terminal and a first null inverting terminal, and the first amplifying circuit is configured to receive a third reference voltage at the first null non-inverting terminal; and the second amplifying circuit includes a second null non-inverting terminal and a second null inverting terminal, and the second amplifying circuit is configured to receive the first compensation voltage at the second null non-inverting terminal, and receive a fourth reference voltage at the second null inverting terminal, and the fourth reference voltage is same as the third reference voltage.
20. An electronic circuit, comprising: a first amplifying circuit configured to generate a first compensation voltage based on a first reference voltage and an output voltage, the output voltage being from a functional circuit block; a second amplifying circuit configured to generate a control voltage based on an input voltage, a second reference voltage and the first compensation voltage, the second reference voltage being different than the first reference voltage; a switching architecture configured to, in a first operation, apply the output voltage to a non-inverting terminal and an inverting terminal of the first amplifying circuit, apply a third reference voltage to a null non-inverting terminal of the first amplifying circuit, and connect an output of the first amplifying circuit to a null inverting terminal of the second amplifying circuit; the switching architecture configured to, in a second operation, apply the output voltage to the inverting terminal of the first amplifying circuit, apply the first reference voltage to the non-inverting terminal of the first amplifying circuit, disconnect the output of the first amplifying circuit from a null inverting terminal of the first amplifying circuit, apply the output of the first amplifying circuit to a null non-inverting terminal of the second amplifying circuit, and apply a fourth reference voltage to the null inverting terminal of the second amplifying circuit; a first charge storing circuit connected to the null non-inverting terminal of the second amplifying circuit; a second charge storing circuit connected to the null inverting terminal of the second amplifying circuit; a third charge storing circuit connected to the null non-inverting terminal of the first amplifying circuit; a fourth charge storing circuit connected to the null inverting terminal of the first amplifying circuit; a first divider circuit configured to divide the first reference voltage by a first ratio to obtain the second reference voltage; and a second divider circuit configured to divide the output voltage by a second ratio to obtain the input voltage, the first ratio is same as the second ratio.
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December 6, 2019
September 28, 2021
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